the fetch mode to use.
The default is DB_FETCHMODE_DEFAULT,
which tells this method to use DB's current fetch mode.
DB's current default fetch mode can be changed using
setFetchMode().
Potential values include:

DB_FETCHMODE_ORDERED

DB_FETCHMODE_ASSOC

DB_FETCHMODE_OBJECT

Return value

array - the first row's data in an array
or a DB_Error object on failure.
The array may be ordered or associative depending on
$fetchmode.
The column index starts at 0 for ordered arrays.